As far as Sollima is concerned, I agree with Phil, only I donāt think character development is essential to his movies. Character development asks for a more epic approach to the narrative; westerns in general, and SW in particular, usually have a more dramatic approach.
In epic stories characters evolve in time gradually (Tolstoyās War and Peace is probably the best example); in dramatic novels the protagonists are affected by an eventful, pivotal situation; usually their response to the situation is quite shocking, even to themselves (Dostojevskiās Crime and Punishment may serve as a reference). They donāt really evolve, but discover, in a rather abrupt way, their genuine nature that was surpressed by one reason or another.
In āFaccia a facciaā VolontĆ© discovers his surpressed violent instincts when heās confronted with Milianās banditry and itās Milian who starts to reflect on his own way of life when confronted with VolontĆ©ās reaction to it.
In La Resa dei Conti, Van Cleefs discovers that he has been acting all the time as a marionet of the powers that be and that the man he is chasing, the alleged criminal Milian, probably has higher moral standards the people who are paying him; in other terms, both the western stereotype of the law-upholding gunman and the law he is upholding are ādeconstructedā.
As for Corbucci, I have five of his films in my Top 20, so itās clear that I adore him. He certainly was a very inventive director, but not a disciplined one and very often, even in his best films, he was rather careless. At his best, he was brilliant, but very often, he simply wasnāt at his best.
Even his undisputed masterpiece, The Great Silence, counts several under-directed sequences, and The Mercenary is (Iām exaggerating a little) a series of brilliant and mediocre scenes thrown together in a narrative that, for most part, doesnāt make much sense.
I was a bit surprised by your praise for Collizi.
Could you elaborate your ideas on Collizi a little? I never thought of him as one of the great SW directors and Iām very curious what you see in him.